Historians can't tell us when, where or 【71】 the first food was cooked. In earliest 【72】 w

hen people had eaten their food 【73】 , an fire was used only to provide heat and light.

The first primitive cooks were 【74】 women, 【75】 preparing food and making clothing were considered women's work. 【76】 most of the great chefs in history have been men. This might have been because chefs learned 【77】 work in the kitchens of rich families 【78】 in restaurants and women didn't often take jobs outside their homes, or it might have been because kitchen equipment was so heavy and difficult to work with 【79】 only strong men could do it. In modern times, great female chefs have become known, and some of the best cook books 【80】 by women.

(71)

A．who

B．which

C．how

D．what